/Engine/Plugins/Experimental/GeometryScripting/Source/GeometryScriptingCore/Public/GeometryScript/ListUtilityFunctions.h
Returns the integer triplet associated with the index Triangle in the Triangle List. If Triangle is not valid for this Triangle List, the triplet (-1, -1, -1) will be returned and bIsValidIndex set to false.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintPure, Category="GeometryScript|ListUtils", Meta=(ScriptMethod)) static FIntVector GetTriangleListItem ( [FGeometryScriptTriangleList](API\Plugins\GeometryScriptingCore\GeometryScript\FGeometryScriptTriangleList) TriangleList, int Triangle, bool & bIsValidTriangle )